package yzx.common.util;


public class StringUtil {

    /**  whether string is null or blank  */
    public static boolean isBlank(String str){
        return str==null || str.trim().isEmpty();
    }


    /** concat string */
    public static String concat(String... str){
        StringBuilder sb = new StringBuilder();
        for (String s : str)
            sb.append(s);
        return sb.toString();
    }

}
